NCS000548_Tiered Response Notice Letter_20181227

December 20, 2018
Attention: Mr. Zahid Khan
NC Dept. of Environmental Quality -
Mooresville Regional Office
Division of Energy, Mineral and Land Resources
610 East Center Ave. Suite 301
Mooresville, NC 28115
DUKE ENERGY CORPORATION
Marshall Steam Station
8320 East NC Highway 150
Terrell, NC 28682
RECEIVED
OENR-OEMLR
Land Quality Section
Mooresville Regrional rm.
Subject: Duke Energy Carolinas, LLC
NPDES Industrial Stormwater Outfall SWO08 Tier Status Notification
Marshall Steam Station - NCS000548 - Catawba County
Dear Mr. Khan:
In accordance with the NPDES Industrial Stormwater Permit NCS000548 (effective May 15, 2015),
Marshall Steam Station is submitting this notification of Tier Three status for the permitted stormwater
outfall SWO08. This notification is submitted within 30 days of receipt of the most -recent laboratory
analytical results for this outfall.
Specifically, results from samples collected at outfall SWO08 for analysis of total suspended solids
(TSS) have been reported above the permitted benchmark of 100 milligrams per liter (mg/L) for four
events since issuance of the current permit. A summary of sampling dates and analytical results is
provided below:
Outfall
Sampling
Date
Analytical
Results
Received
Reported TSS
(mg/L)
12/14/2015
01/07/2016
380
06/27/2016
07/13/2016
160
06/22/2017
07/06/2017
220
11 /18/2018
11 /29/2018
110
- Outfall SWO08 consists of one catch basin that drains a small paved area along a narrow driveway
east of the Powerhouse. Potential sources of TSS to outfall SWO08 may have included episodic
vehicle tracking from unpaved driveway and parking areas located south of the Powerhouse.
Previous mitigation measures have included placement of filters around and inside the catch basin as
well as routine sweeping of drainage area.
www.duke-energy.com

DUKE ENERGY CORPORATION
Marshall Steam Station
8320 East NC Highway 150
Terrell, NC 28682
Since receipt of the Year 4 Period 1 analytical results for Marshall, the unpaved areas south of
the Powerhouse have been paved and a significant reduction in tracking from these areas is
anticipated. Marshall will continue to manage and maintain the good housekeeping program for
this outfall in accordance to the station's Stormwater Pollution Prevention Plan.
If you have questions or need additional information please contact Brad Loveland at (704) 609-
5637 or [e-mail].
"I certify, under penalty of law, that this document and all attachments were prepared under my direction
or supervision in accordance with a system designed to assure that qualified personnel properly gather and
evaluate the information submitted. Based on my inquiry of the person or persons who manage the system,
or those persons directly responsible for gathering the information, the information submitted is, to the
best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant
penalties for submitting false information, including the possibility of fines and imprisonment for knowing
violations."
Sincerely,
�,f 1,�Ox
Rick R. Roper
General Manager III
Marshall Steam Station
attachment
www.duke-energy.com

DUKE ENERGY CORPORATION
Marshall Steam Station
8320 East NC Highway 150
Terrell, NC 28682
be w/attachment: Scott La Sala
Brad Loveland
Tina Woodward
File: CCP EHS
UPS Tracking Number 1Z8955X40395659551 Raleigh Central Office
www.duke-energy.com